The microstructure and properties of a powder-processed copper-niobium alloy

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5477778

Zeik, K L

High-pressure gas atomization (HPGA) was used to produce rapidly solidified Cu-21.2Nb-1.8Mo (wt%) alloy powders with a range of microstructures found to be dependent on powder size. Specifically, the microstructures of fine-scale powders (<15 {mu}m diameter) were characterized by a predominance of multiphase spheroids and a small population of Nb-based dendrites distributed within an almost pure copper matrix. In contrast, the larger particles (< 45 {mu}m diameter) were found to contain only Nb-based dendrites distributed within a copper matrix. The change in microstructure as a function of powder particle size was analyzed in terms of both the amount of undercooling and the cooling rate of the liquids prior to and during solidification. Yield behavior, flow behavior, parabolic strain hardening, and thermal stability of HPGA materials were determined, and results are discussed briefly.

• Research Organization: Pennsylvania State Univ., University Park, PA (United States)
• OSTI ID: 5477778
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals &amp; Alloys-- Structure &amp; Phase Studies
360103* -- Metals &amp; Alloys-- Mechanical Properties
ALLOYS
COPPER ALLOYS
COPPER BASE ALLOYS
CRYSTAL STRUCTURE
MECHANICAL PROPERTIES
METALLURGY
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
PARTICLE SIZE
POWDER METALLURGY
POWDERS
SIZE